<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <script type="text/javascript">
      function tulin(say) {
        switch (say) {
          case 'tu':
            console.log('tututuutu t');
            break;
          default:

        }
      }

      tulin('tu');
    </script>
  </body>
</html>
